652 lines
15 KiB
C
652 lines
15 KiB
C
/*
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* (C) Copyright 2009-2010
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* Nokia Siemens Networks, michael.lawnick.ext@nsn.com
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*
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* Portions Copyright (C) 2010 Cavium Networks, Inc.
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*
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* This is a driver for the i2c adapter in Cavium Networks' OCTEON processors.
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <asm/octeon/octeon.h>
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#define DRV_NAME "i2c-octeon"
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/* The previous out-of-tree version was implicitly version 1.0. */
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#define DRV_VERSION "2.0"
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/* register offsets */
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#define SW_TWSI 0x00
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#define TWSI_INT 0x10
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/* Controller command patterns */
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#define SW_TWSI_V 0x8000000000000000ull
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#define SW_TWSI_EOP_TWSI_DATA 0x0C00000100000000ull
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#define SW_TWSI_EOP_TWSI_CTL 0x0C00000200000000ull
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#define SW_TWSI_EOP_TWSI_CLKCTL 0x0C00000300000000ull
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#define SW_TWSI_EOP_TWSI_STAT 0x0C00000300000000ull
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#define SW_TWSI_EOP_TWSI_RST 0x0C00000700000000ull
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#define SW_TWSI_OP_TWSI_CLK 0x0800000000000000ull
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#define SW_TWSI_R 0x0100000000000000ull
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/* Controller command and status bits */
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#define TWSI_CTL_CE 0x80
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#define TWSI_CTL_ENAB 0x40
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#define TWSI_CTL_STA 0x20
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#define TWSI_CTL_STP 0x10
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#define TWSI_CTL_IFLG 0x08
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#define TWSI_CTL_AAK 0x04
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/* Some status values */
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#define STAT_START 0x08
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#define STAT_RSTART 0x10
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#define STAT_TXADDR_ACK 0x18
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#define STAT_TXDATA_ACK 0x28
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#define STAT_RXADDR_ACK 0x40
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#define STAT_RXDATA_ACK 0x50
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#define STAT_IDLE 0xF8
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struct octeon_i2c {
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wait_queue_head_t queue;
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struct i2c_adapter adap;
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int irq;
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int twsi_freq;
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int sys_freq;
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resource_size_t twsi_phys;
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void __iomem *twsi_base;
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resource_size_t regsize;
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struct device *dev;
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};
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/**
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* octeon_i2c_write_sw - write an I2C core register.
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* @i2c: The struct octeon_i2c.
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* @eop_reg: Register selector.
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* @data: Value to be written.
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*
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* The I2C core registers are accessed indirectly via the SW_TWSI CSR.
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*/
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static void octeon_i2c_write_sw(struct octeon_i2c *i2c,
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u64 eop_reg,
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u8 data)
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{
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u64 tmp;
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__raw_writeq(SW_TWSI_V | eop_reg | data, i2c->twsi_base + SW_TWSI);
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do {
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tmp = __raw_readq(i2c->twsi_base + SW_TWSI);
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} while ((tmp & SW_TWSI_V) != 0);
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}
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/**
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* octeon_i2c_read_sw - write an I2C core register.
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* @i2c: The struct octeon_i2c.
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* @eop_reg: Register selector.
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*
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* Returns the data.
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*
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* The I2C core registers are accessed indirectly via the SW_TWSI CSR.
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*/
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static u8 octeon_i2c_read_sw(struct octeon_i2c *i2c, u64 eop_reg)
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{
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u64 tmp;
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__raw_writeq(SW_TWSI_V | eop_reg | SW_TWSI_R, i2c->twsi_base + SW_TWSI);
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do {
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tmp = __raw_readq(i2c->twsi_base + SW_TWSI);
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} while ((tmp & SW_TWSI_V) != 0);
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return tmp & 0xFF;
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}
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/**
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* octeon_i2c_write_int - write the TWSI_INT register
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* @i2c: The struct octeon_i2c.
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* @data: Value to be written.
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*/
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static void octeon_i2c_write_int(struct octeon_i2c *i2c, u64 data)
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{
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u64 tmp;
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__raw_writeq(data, i2c->twsi_base + TWSI_INT);
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tmp = __raw_readq(i2c->twsi_base + TWSI_INT);
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}
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/**
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* octeon_i2c_int_enable - enable the TS interrupt.
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* @i2c: The struct octeon_i2c.
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*
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* The interrupt will be asserted when there is non-STAT_IDLE state in
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* the SW_TWSI_EOP_TWSI_STAT register.
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*/
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static void octeon_i2c_int_enable(struct octeon_i2c *i2c)
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{
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octeon_i2c_write_int(i2c, 0x40);
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}
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/**
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* octeon_i2c_int_disable - disable the TS interrupt.
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* @i2c: The struct octeon_i2c.
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*/
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static void octeon_i2c_int_disable(struct octeon_i2c *i2c)
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{
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octeon_i2c_write_int(i2c, 0);
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}
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/**
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* octeon_i2c_unblock - unblock the bus.
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* @i2c: The struct octeon_i2c.
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*
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* If there was a reset while a device was driving 0 to bus,
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* bus is blocked. We toggle it free manually by some clock
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* cycles and send a stop.
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*/
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static void octeon_i2c_unblock(struct octeon_i2c *i2c)
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{
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int i;
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dev_dbg(i2c->dev, "%s\n", __func__);
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for (i = 0; i < 9; i++) {
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octeon_i2c_write_int(i2c, 0x0);
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udelay(5);
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octeon_i2c_write_int(i2c, 0x200);
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udelay(5);
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}
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octeon_i2c_write_int(i2c, 0x300);
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udelay(5);
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octeon_i2c_write_int(i2c, 0x100);
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udelay(5);
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octeon_i2c_write_int(i2c, 0x0);
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}
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/**
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* octeon_i2c_isr - the interrupt service routine.
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* @int: The irq, unused.
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* @dev_id: Our struct octeon_i2c.
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*/
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static irqreturn_t octeon_i2c_isr(int irq, void *dev_id)
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{
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struct octeon_i2c *i2c = dev_id;
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octeon_i2c_int_disable(i2c);
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wake_up_interruptible(&i2c->queue);
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return IRQ_HANDLED;
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}
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static int octeon_i2c_test_iflg(struct octeon_i2c *i2c)
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{
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return (octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_CTL) & TWSI_CTL_IFLG) != 0;
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}
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/**
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* octeon_i2c_wait - wait for the IFLG to be set.
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* @i2c: The struct octeon_i2c.
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*
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* Returns 0 on success, otherwise a negative errno.
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*/
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static int octeon_i2c_wait(struct octeon_i2c *i2c)
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{
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int result;
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octeon_i2c_int_enable(i2c);
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result = wait_event_interruptible_timeout(i2c->queue,
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octeon_i2c_test_iflg(i2c),
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i2c->adap.timeout);
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octeon_i2c_int_disable(i2c);
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if (result < 0) {
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dev_dbg(i2c->dev, "%s: wait interrupted\n", __func__);
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return result;
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} else if (result == 0) {
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dev_dbg(i2c->dev, "%s: timeout\n", __func__);
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result = -ETIMEDOUT;
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}
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return 0;
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}
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/**
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* octeon_i2c_start - send START to the bus.
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* @i2c: The struct octeon_i2c.
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*
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* Returns 0 on success, otherwise a negative errno.
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*/
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static int octeon_i2c_start(struct octeon_i2c *i2c)
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{
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u8 data;
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int result;
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
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TWSI_CTL_ENAB | TWSI_CTL_STA);
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result = octeon_i2c_wait(i2c);
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if (result) {
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if (octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT) == STAT_IDLE) {
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/*
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* Controller refused to send start flag May
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* be a client is holding SDA low - let's try
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* to free it.
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*/
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octeon_i2c_unblock(i2c);
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
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TWSI_CTL_ENAB | TWSI_CTL_STA);
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result = octeon_i2c_wait(i2c);
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}
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if (result)
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return result;
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}
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data = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
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if ((data != STAT_START) && (data != STAT_RSTART)) {
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dev_err(i2c->dev, "%s: bad status (0x%x)\n", __func__, data);
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return -EIO;
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}
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return 0;
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}
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/**
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* octeon_i2c_stop - send STOP to the bus.
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* @i2c: The struct octeon_i2c.
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*
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* Returns 0 on success, otherwise a negative errno.
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*/
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static int octeon_i2c_stop(struct octeon_i2c *i2c)
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{
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u8 data;
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
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TWSI_CTL_ENAB | TWSI_CTL_STP);
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data = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
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if (data != STAT_IDLE) {
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dev_err(i2c->dev, "%s: bad status(0x%x)\n", __func__, data);
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return -EIO;
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}
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return 0;
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}
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/**
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* octeon_i2c_write - send data to the bus.
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* @i2c: The struct octeon_i2c.
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* @target: Target address.
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* @data: Pointer to the data to be sent.
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* @length: Length of the data.
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*
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* The address is sent over the bus, then the data.
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*
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* Returns 0 on success, otherwise a negative errno.
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*/
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static int octeon_i2c_write(struct octeon_i2c *i2c, int target,
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const u8 *data, int length)
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{
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int i, result;
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u8 tmp;
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result = octeon_i2c_start(i2c);
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if (result)
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return result;
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, target << 1);
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
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result = octeon_i2c_wait(i2c);
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if (result)
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return result;
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for (i = 0; i < length; i++) {
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tmp = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
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if ((tmp != STAT_TXADDR_ACK) && (tmp != STAT_TXDATA_ACK)) {
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dev_err(i2c->dev,
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"%s: bad status before write (0x%x)\n",
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__func__, tmp);
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return -EIO;
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}
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, data[i]);
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
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result = octeon_i2c_wait(i2c);
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if (result)
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return result;
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}
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return 0;
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}
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/**
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* octeon_i2c_read - receive data from the bus.
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* @i2c: The struct octeon_i2c.
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* @target: Target address.
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* @data: Pointer to the location to store the datae .
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* @length: Length of the data.
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*
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* The address is sent over the bus, then the data is read.
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*
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* Returns 0 on success, otherwise a negative errno.
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*/
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static int octeon_i2c_read(struct octeon_i2c *i2c, int target,
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u8 *data, int length)
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{
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int i, result;
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u8 tmp;
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if (length < 1)
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return -EINVAL;
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result = octeon_i2c_start(i2c);
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if (result)
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return result;
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, (target<<1) | 1);
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
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result = octeon_i2c_wait(i2c);
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if (result)
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return result;
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for (i = 0; i < length; i++) {
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tmp = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
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if ((tmp != STAT_RXDATA_ACK) && (tmp != STAT_RXADDR_ACK)) {
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dev_err(i2c->dev,
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"%s: bad status before read (0x%x)\n",
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__func__, tmp);
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return -EIO;
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}
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if (i+1 < length)
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
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TWSI_CTL_ENAB | TWSI_CTL_AAK);
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else
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octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL,
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TWSI_CTL_ENAB);
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result = octeon_i2c_wait(i2c);
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if (result)
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return result;
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data[i] = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_DATA);
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}
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return 0;
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}
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/**
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* octeon_i2c_xfer - The driver's master_xfer function.
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* @adap: Pointer to the i2c_adapter structure.
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* @msgs: Pointer to the messages to be processed.
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* @num: Length of the MSGS array.
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*
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* Returns the number of messages processed, or a negative errno on
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* failure.
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*/
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static int octeon_i2c_xfer(struct i2c_adapter *adap,
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struct i2c_msg *msgs,
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int num)
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{
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struct i2c_msg *pmsg;
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int i;
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int ret = 0;
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struct octeon_i2c *i2c = i2c_get_adapdata(adap);
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for (i = 0; ret == 0 && i < num; i++) {
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pmsg = &msgs[i];
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dev_dbg(i2c->dev,
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"Doing %s %d byte(s) to/from 0x%02x - %d of %d messages\n",
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pmsg->flags & I2C_M_RD ? "read" : "write",
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pmsg->len, pmsg->addr, i + 1, num);
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if (pmsg->flags & I2C_M_RD)
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ret = octeon_i2c_read(i2c, pmsg->addr, pmsg->buf,
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pmsg->len);
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else
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ret = octeon_i2c_write(i2c, pmsg->addr, pmsg->buf,
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pmsg->len);
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}
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octeon_i2c_stop(i2c);
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return (ret != 0) ? ret : num;
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}
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static u32 octeon_i2c_functionality(struct i2c_adapter *adap)
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{
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return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
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}
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static const struct i2c_algorithm octeon_i2c_algo = {
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.master_xfer = octeon_i2c_xfer,
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.functionality = octeon_i2c_functionality,
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};
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static struct i2c_adapter octeon_i2c_ops = {
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.owner = THIS_MODULE,
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.name = "OCTEON adapter",
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.algo = &octeon_i2c_algo,
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.timeout = 2,
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};
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/**
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* octeon_i2c_setclock - Calculate and set clock divisors.
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*/
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static int __init octeon_i2c_setclock(struct octeon_i2c *i2c)
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{
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int tclk, thp_base, inc, thp_idx, mdiv_idx, ndiv_idx, foscl, diff;
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int thp = 0x18, mdiv = 2, ndiv = 0, delta_hz = 1000000;
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for (ndiv_idx = 0; ndiv_idx < 8 && delta_hz != 0; ndiv_idx++) {
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/*
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* An mdiv value of less than 2 seems to not work well
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* with ds1337 RTCs, so we constrain it to larger
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* values.
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*/
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for (mdiv_idx = 15; mdiv_idx >= 2 && delta_hz != 0; mdiv_idx--) {
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/*
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* For given ndiv and mdiv values check the
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* two closest thp values.
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*/
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tclk = i2c->twsi_freq * (mdiv_idx + 1) * 10;
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tclk *= (1 << ndiv_idx);
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thp_base = (i2c->sys_freq / (tclk * 2)) - 1;
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for (inc = 0; inc <= 1; inc++) {
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thp_idx = thp_base + inc;
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if (thp_idx < 5 || thp_idx > 0xff)
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continue;
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foscl = i2c->sys_freq / (2 * (thp_idx + 1));
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foscl = foscl / (1 << ndiv_idx);
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foscl = foscl / (mdiv_idx + 1) / 10;
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diff = abs(foscl - i2c->twsi_freq);
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if (diff < delta_hz) {
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delta_hz = diff;
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thp = thp_idx;
|
|
mdiv = mdiv_idx;
|
|
ndiv = ndiv_idx;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
octeon_i2c_write_sw(i2c, SW_TWSI_OP_TWSI_CLK, thp);
|
|
octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CLKCTL, (mdiv << 3) | ndiv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init octeon_i2c_initlowlevel(struct octeon_i2c *i2c)
|
|
{
|
|
u8 status;
|
|
int tries;
|
|
|
|
/* disable high level controller, enable bus access */
|
|
octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
|
|
|
|
/* reset controller */
|
|
octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_RST, 0);
|
|
|
|
for (tries = 10; tries; tries--) {
|
|
udelay(1);
|
|
status = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT);
|
|
if (status == STAT_IDLE)
|
|
return 0;
|
|
}
|
|
dev_err(i2c->dev, "%s: TWSI_RST failed! (0x%x)\n", __func__, status);
|
|
return -EIO;
|
|
}
|
|
|
|
static int __devinit octeon_i2c_probe(struct platform_device *pdev)
|
|
{
|
|
int irq, result = 0;
|
|
struct octeon_i2c *i2c;
|
|
struct octeon_i2c_data *i2c_data;
|
|
struct resource *res_mem;
|
|
|
|
/* All adaptors have an irq. */
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
|
|
if (!i2c) {
|
|
dev_err(&pdev->dev, "kzalloc failed\n");
|
|
result = -ENOMEM;
|
|
goto out;
|
|
}
|
|
i2c->dev = &pdev->dev;
|
|
i2c_data = pdev->dev.platform_data;
|
|
|
|
res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
|
if (res_mem == NULL) {
|
|
dev_err(i2c->dev, "found no memory resource\n");
|
|
result = -ENXIO;
|
|
goto fail_region;
|
|
}
|
|
|
|
if (i2c_data == NULL) {
|
|
dev_err(i2c->dev, "no I2C frequency data\n");
|
|
result = -ENXIO;
|
|
goto fail_region;
|
|
}
|
|
|
|
i2c->twsi_phys = res_mem->start;
|
|
i2c->regsize = resource_size(res_mem);
|
|
i2c->twsi_freq = i2c_data->i2c_freq;
|
|
i2c->sys_freq = i2c_data->sys_freq;
|
|
|
|
if (!request_mem_region(i2c->twsi_phys, i2c->regsize, res_mem->name)) {
|
|
dev_err(i2c->dev, "request_mem_region failed\n");
|
|
goto fail_region;
|
|
}
|
|
i2c->twsi_base = ioremap(i2c->twsi_phys, i2c->regsize);
|
|
|
|
init_waitqueue_head(&i2c->queue);
|
|
|
|
i2c->irq = irq;
|
|
|
|
result = request_irq(i2c->irq, octeon_i2c_isr, 0, DRV_NAME, i2c);
|
|
if (result < 0) {
|
|
dev_err(i2c->dev, "failed to attach interrupt\n");
|
|
goto fail_irq;
|
|
}
|
|
|
|
result = octeon_i2c_initlowlevel(i2c);
|
|
if (result) {
|
|
dev_err(i2c->dev, "init low level failed\n");
|
|
goto fail_add;
|
|
}
|
|
|
|
result = octeon_i2c_setclock(i2c);
|
|
if (result) {
|
|
dev_err(i2c->dev, "clock init failed\n");
|
|
goto fail_add;
|
|
}
|
|
|
|
i2c->adap = octeon_i2c_ops;
|
|
i2c->adap.dev.parent = &pdev->dev;
|
|
i2c->adap.nr = pdev->id >= 0 ? pdev->id : 0;
|
|
i2c_set_adapdata(&i2c->adap, i2c);
|
|
platform_set_drvdata(pdev, i2c);
|
|
|
|
result = i2c_add_numbered_adapter(&i2c->adap);
|
|
if (result < 0) {
|
|
dev_err(i2c->dev, "failed to add adapter\n");
|
|
goto fail_add;
|
|
}
|
|
|
|
dev_info(i2c->dev, "version %s\n", DRV_VERSION);
|
|
|
|
return result;
|
|
|
|
fail_add:
|
|
platform_set_drvdata(pdev, NULL);
|
|
free_irq(i2c->irq, i2c);
|
|
fail_irq:
|
|
iounmap(i2c->twsi_base);
|
|
release_mem_region(i2c->twsi_phys, i2c->regsize);
|
|
fail_region:
|
|
kfree(i2c);
|
|
out:
|
|
return result;
|
|
};
|
|
|
|
static int __devexit octeon_i2c_remove(struct platform_device *pdev)
|
|
{
|
|
struct octeon_i2c *i2c = platform_get_drvdata(pdev);
|
|
|
|
i2c_del_adapter(&i2c->adap);
|
|
platform_set_drvdata(pdev, NULL);
|
|
free_irq(i2c->irq, i2c);
|
|
iounmap(i2c->twsi_base);
|
|
release_mem_region(i2c->twsi_phys, i2c->regsize);
|
|
kfree(i2c);
|
|
return 0;
|
|
};
|
|
|
|
static struct platform_driver octeon_i2c_driver = {
|
|
.probe = octeon_i2c_probe,
|
|
.remove = __devexit_p(octeon_i2c_remove),
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = DRV_NAME,
|
|
},
|
|
};
|
|
|
|
static int __init octeon_i2c_init(void)
|
|
{
|
|
int rv;
|
|
|
|
rv = platform_driver_register(&octeon_i2c_driver);
|
|
return rv;
|
|
}
|
|
|
|
static void __exit octeon_i2c_exit(void)
|
|
{
|
|
platform_driver_unregister(&octeon_i2c_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Michael Lawnick <michael.lawnick.ext@nsn.com>");
|
|
MODULE_DESCRIPTION("I2C-Bus adapter for Cavium OCTEON processors");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(DRV_VERSION);
|
|
MODULE_ALIAS("platform:" DRV_NAME);
|
|
|
|
module_init(octeon_i2c_init);
|
|
module_exit(octeon_i2c_exit);
|